Des Moines, Iowa-based metal giants SLIPKNOT have posted another teaser photograph from a recent photo shoot below. It is not presently clear if the picture in question is a preview of the new series of masks which the band will don on the upcoming Rockstar Energy Mayhem festival, set to kick off July 9 at the White River Amphitheatre in Seattle.

According to HMV.co.uk, Roadrunner Records has set an August 11 UK release date (one day later in the U.S.) for the much-anticipated new SLIPKNOT album. The as-yet-untitled follow-up to 2004's "Vol. 3: (The Subliminal Verses)" is being recorded with producer Dave Fortman, who has previously worked with MUDVAYNE and EVANESCENCE.